Dowel-joint.



J. W. COOPER. DoWEL JOINT. APHJOATION P ILEI) MAB. 29, 1909.

981,385. Patented Jan. 1o, 1911.

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JOEN W. COOPER, OF BUFFALO, NEW YORK, ASSIGNOR T0 THE ENTERPRISESPECIALTY COMPANY, 0F COLUMBUS,

OHIO, A CORPORATION.

DOWEL-JOINT.

To alt whom t may concern:

Be it known that I, JOHN `W. COOPER, citizen of the United States,residing at Bualo, in the county of Erie and State of New York, haveinvented certain new and useful improvements in Bowel-Joints, of whichthe following is a specification.

My invention relates to woodwork joints, and particularly to a joint forconnecting two contacting pieces of timber, the invention consistingbroadly in providing the two adjacent pieces of timber with aliningpassages, inserting` a dowel in the alining passages so that the dowelshall project into both pieces of timber, and providing the dowel withan outer sectional sleeve which is formed with outwardly projectingburs, so that when the dowel is driven into position, it will force theSections of the sleeve outward, forcing the burs into the wood of thetwo pieces of timber, thereby holding the two pieces rigidly togetherand forming an extremely strong and edect-ive joint.

'lhe drawings show my improved joint as used in connecting two pieces oftimber, one running at right angles to the other, and therein: Figure lis a section through two contiguous members of a structure, showing theposition of my sleeve sections before the insertion of the dowel; Fig. 2is a like View after the insertion of the dowel; Fig. 8 is a fragmentaryend view showing the tongue and groove joint between the two timbermembers; and, Fig. 4: is a perspective view showing one sleeve sectionand the tubular dowel.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

Referring to the drawings, 2 and 3 designate adjacent pieces of timber,the ond of the piece 3 abutting against the edge of the piece 2, the twopieces being bored with alining passages l and 5. After the two piecesof timber have been placed in juxtaposition to each other, so that theirpassages 4C and 5 aline, the two independent sections G and 7 of asleeve, are inserted. These are shown in the perspective view, Fig. ll,and are preferably laterally curved and have a plurality of perforationsmade through them. These perforations are Speccation of Letters Patent.

Patented J an. 10, 1911.

Serial No. 486,536.

made by driving an instrument through from the back or inside face ofthe sleeve, thus forming a plurality of burs or prongs which projectoutwardly from the sleeves. After the sections 6 and 7 of the sleeve arein place, the dowel pin 8 is inserted between the sections and is drivendown into a position where it extends into both of the pieces of timber,as shown in Fig. l. This dowel pin being forced down in this manner,forces Or expands the sect-ion 6 and 7 outwardly, and forces the burs 9into the wood, thereby practically locking the two pieces of wood toeach other against any longitudinal movement and against any movement ofrotation around the dowel pin S relative to each other. rlfter the dowelpin and the sections 6 and 7 are in place, the passage t may be closed,as at l0, by a plug of wood, putty, or other material. While l mightform the dowel 8 solid, l prefer to make it of a section of metal tube,as l have found in practice that this gives a joint of maximum strength,yet with a minimum of weight.

While may form the abutting faces of the timbers 2 and 3 in any desiredmanner, l preferably form the portion 3 with a tongue l1, and form theedge of the timber 2 with a corresponding groove. It is obvious alsothat I am not limited to this form of joint. I have found in practicethat timbers connected to each other by the joint above described, arevery rigidly held in place, and that the timbers do nottend to separateat the joint.

While l do not wish to limit myself to the use of this joint in anyparticular situation, I may say that in practice l have found itparticularly useful in connecting the framing of door or window panelingand the connection of the frames of window sashes.

Having thus described the invention, what is claimed as new is Afastening device comprising separable concavo-convex sections of uniformlength and thickness and having their concave faces smooth andunobstructed and their convex faces provided with circumferentialupstruck spurs disposed in staggered relation, in combination withabutting sections having registering openings adapted to receive saidsections, the circumferential spurs of the concavo-convex sections beingadapted to beur against the Walls of the openings for centering thesections therein when the longitudinal edges of Said sections aredisposed in Contact with each other, and adapted to be embedded in theWalls of the openings when the concave-Convex sections are separated.

In testimony whereof, l nHix niy signature in presence of two Witnessee.

JOHN W. COOPER.

Vtnesses:

S. D. DONEY, G. L. BARNHART.

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